JPS5758436A - Main oscillating system of pilot multiplying type carrier current - Google Patents
Main oscillating system of pilot multiplying type carrier currentInfo
- Publication number
- JPS5758436A JPS5758436A JP55133000A JP13300080A JPS5758436A JP S5758436 A JPS5758436 A JP S5758436A JP 55133000 A JP55133000 A JP 55133000A JP 13300080 A JP13300080 A JP 13300080A JP S5758436 A JPS5758436 A JP S5758436A
- Authority
- JP
- Japan
- Prior art keywords
- pilot
- circuit
- frequency
- multiplying
- main oscillation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/08—Speed or phase control by synchronisation signals the synchronisation signals recurring cyclically
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
PURPOSE:To economize the system, by multiplying the frequency of transmission synchronizing pilot received from a master station in a slave station and froming the same output frequency as the main oscillation circuit. CONSTITUTION:A transmission synchronizing pilot transmitted from a master station is received at a pilot extracting circuit 2 via a hybrid circuit 1 from a transmission line 8 together with other information signals. The pilot is extracted at the circuit 2 and is given to a pilot multiplying circuit 3, a pilot level monitoring circuit 4 and an automatic frequency controlling circuit 5. In the pilot multiplying circuit 3, the frequency of the received transmission synchronizing pilot is multiplied into the same frequency as the frequency of the main oscillation circuit and outputted as the main oscillation current now in use. The oscillating frequency of a main oscillation circuit 6 for spare carrier current is controlled through the collation with the transmission synchronizing pilot frequency obtained from the pilot extracting circuit 2 normally and if the pilot signal is interrupted, the output of the oscillation circuit 6 is selected.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55133000A JPS5758436A (en) | 1980-09-26 | 1980-09-26 | Main oscillating system of pilot multiplying type carrier current |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55133000A JPS5758436A (en) | 1980-09-26 | 1980-09-26 | Main oscillating system of pilot multiplying type carrier current |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5758436A true JPS5758436A (en) | 1982-04-08 |
Family
ID=15094438
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55133000A Pending JPS5758436A (en) | 1980-09-26 | 1980-09-26 | Main oscillating system of pilot multiplying type carrier current |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5758436A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62277828A (en) * | 1986-05-27 | 1987-12-02 | Mitsubishi Electric Corp | Optical transmission equipment |
-
1980
- 1980-09-26 JP JP55133000A patent/JPS5758436A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62277828A (en) * | 1986-05-27 | 1987-12-02 | Mitsubishi Electric Corp | Optical transmission equipment |
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